Mesh to Micron Conversion Table & Calculator for Ceramic Materials
Ceramic raw materials are still specified in both mesh and microns, sometimes within the same process. A supplier may sell a material as 200 mesh while an internal spec or particle size report is written in microns. This table is a quick reference for translating between the two in ceramic and mineral processing work.
Mesh to Micron Conversion Table
Mesh refers to the number of openings per linear inch in a woven screen. Microns describe the nominal opening size in metric units. In practice, most mesh-to-micron conversions are handled with a sieve opening table, not a formula.
| U.S. Mesh | Opening (in.) | Opening (mm) | Opening (microns) |
| 4 | 0.1870 | 4.75 | 4750 |
| 5 | 0.1570 | 4.00 | 4000 |
| 6 | 0.1320 | 3.35 | 3350 |
| 8 | 0.0937 | 2.36 | 2360 |
| 10 | 0.0787 | 2.00 | 2000 |
| 12 | 0.0661 | 1.70 | 1700 |
| 14 | 0.0555 | 1.40 | 1400 |
| 16 | 0.0469 | 1.18 | 1180 |
| 18 | 0.0394 | 1.00 | 1000 |
| 20 | 0.0331 | 0.850 | 850 |
| 25 | 0.0280 | 0.710 | 710 |
| 30 | 0.0234 | 0.600 | 600 |
| 35 | 0.0197 | 0.500 | 500 |
| 40 | 0.0165 | 0.425 | 425 |
| 45 | 0.0138 | 0.355 | 355 |
| 50 | 0.0117 | 0.300 | 300 |
| 60 | 0.0098 | 0.250 | 250 |
| 70 | 0.0083 | 0.212 | 212 |
| 80 | 0.0070 | 0.180 | 180 |
| 100 | 0.0059 | 0.150 | 150 |
| 120 | 0.0049 | 0.125 | 125 |
| 140 | 0.0041 | 0.106 | 106 |
| 170 | 0.0035 | 0.090 | 90 |
| 200 | 0.0029 | 0.075 | 75 |
| 230 | 0.0024 | 0.063 | 63 |
| 270 | 0.0021 | 0.053 | 53 |
| 325 | 0.0017 | 0.045 | 45 |
| 400 | 0.0015 | 0.038 | 38 |
A few of the conversions that come up often in ceramics are:
- 40 mesh = 425 microns
- 60 mesh = 250 microns
- 100 mesh = 150 microns
- 200 mesh = 75 microns
- 325 mesh = 45 microns
Why Mesh to Micron Conversion is Only Approximate
Mesh is a screen designation, not a full particle size measurement. A material sold as -200 mesh may pass a 75 micron screen, but that does not mean the powder is centered at 75 microns or even close to it. It may contain a broad spread of finer particles, agglomerates, or particles whose shape changes how they pass through a screen.
Screen opening is not the same as particle size distribution
A material described as “-200 mesh” usually means it passed a 200 mesh screen, or roughly 75 microns. It does not tell you how much of that material is 60 microns, 20 microns, or 2 microns. Two powders can both be sold as -200 mesh and still behave very differently during mixing, pressing, casting, drying, and firing.
Particle shape affects screening behavior
Platy calcined clay, angular fused silica, tabular alumina fines, and spherical spray dried granules do not pass screens the same way. Long or flat particles can orient through an opening that looks smaller than the particle’s largest dimension. Agglomerates can do the opposite and hang up on a screen even when the primary particles are much finer.
Moisture and agglomeration can distort sieve results
Fine ceramic powders do not always behave like dry granular media. Moisture pickup, static, binder residue, and soft agglomerates can all shift apparent sieve performance. A material may test coarse on a screen and still have a much finer PSD when measured by another method.
Screening and PSD are describing different things
A process specification may call for less than 1% retained on 325 mesh. A separate raw material specification may call for a D50 of 8 µm or a D90 below 45 µm. Those numbers may be related, but they are not interchangeable. One is a screen-based cutoff. The other describes a particle size distribution.
Where Mesh and Micron Show Up in Ceramic Manufacturing
Raw material purchasing and specification review
Mesh-to-micron conversion comes up when comparing supplier data sheets or qualifying alternate raw materials. One source may list calcined alumina, silica, mullite, zircon, or grog in mesh. Another may provide a micron value or a PSD curve. A conversion table helps get those specifications into the same size range before deciding if the materials are actually comparable.
For coarse materials such as grog, tabular alumina fractions, chamotte, bubble alumina, silicon carbide grain, and porous ceramic media feedstocks, mesh-based sizing often makes sense because the process is built around screening and packing behavior. For fine matrix powders, micron and PSD data usually tell you more.
Milling, screen residue, post-mill cleanup
Screens are often used after dry milling or wet milling as a process control tool rather than a full particle size specification. A glaze may be milled and checked for residue on 325 mesh. A spray dried body formulation may be screened through 20 or 30 mesh before packaging to remove agglomerates. A refractory batch may be scalped after grinding to remove coarse oversize before blending.
Those checks are useful for controlling coarse oversize, but they are not a substitute for full PSD data when slurry behavior, packing, or sintering response matter.
Formulation packing, permeability, fired porosity
Changing from a 100 mesh silica to a 200 mesh silica does more than change a purchasing description. It can affect particle packing, pore size distribution, drying behavior, binder demand, permeability, and fired density.
That is especially relevant in porous ceramics, filtration media, and refractories. A refractory grog blend might call for a coarse fraction between 10 and 30 mesh, a medium fraction between 30 and 80 mesh, and a fine matrix below 200 mesh. In that case, mesh sizing is tied directly to packing behavior and fired pore structure.
Need Help Sorting Out a Ceramic Raw Material Spec?
If you are evaluating screen cuts, particle size specifications, milling targets, or raw material selection for a ceramic process, IntoCeramics can help. Our ceramic manufacturing company works with manufacturers on ceramic processing, toll manufacturing, and production troubleshooting based on how industrial ceramic materials behave in real plant environments.
Contact us today to discuss more.